Vulnerabilities affecting this package (0)
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This package is not known to be affected by vulnerabilities.
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Vulnerabilities fixed by this package (1)
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VCID-q9nm-2b34-yked
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Webcache Poisoning in symfony/http-kernel
Description
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When a Symfony application is running behind a proxy or a load-balancer, you can tell Symfony to look for the `X-Forwarded-*` HTTP headers. HTTP headers that are not part of the "trusted_headers" allowed list are ignored and protect you from "Cache poisoning" attacks.
In Symfony 5.2, we've added support for the `X-Forwarded-Prefix` header, but this header was accessible in sub-requests, even if it was not part of the "trusted_headers" allowed list. An attacker could leverage this opportunity to forge requests containing a `X-Forwarded-Prefix` HTTP header, leading to a web cache poisoning issue.
Resolution
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Symfony now ensures that the `X-Forwarded-Prefix` HTTP header is not forwarded to sub-requests when it is not trusted.
The patch for this issue is available [here](https://github.com/symfony/symfony/commit/95dcf51682029e89450aee86267e3d553aa7c487) for branch 5.3.
Credits
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We would like to thank Soner Sayakci for reporting the issue and Jérémy Derussé for fixing the issue.
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CVE-2021-41267
GHSA-q3j3-w37x-hq2q
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